I think, that if you match the jacket colour to a colour in the kilt, you're fine. I own a MacIntosh hunting that is of course, predominantly green, but there is navy blue in it. To not overdue the green of the kilt, I bought a navy blue argyll jacket for it. Also, I was a commissioned naval officer, and that warranted a navy jacket. I wear navy, green, off-white or cream-coloured hose depending on the occasion and time of day; dark for formal/evening and lighter for day wear.
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